There are many hazards that can arise in confined spaces. Inarguably, the hazard that results in more fatalities in confined spaces are atmospheric in nature. In fact, at the time of writing this article, the last five recorded confined space deaths, according to OSHA Fatality Inspection Data, were caused by asphyxiation. This is because generally we can’t see, hear, taste, smell, or touch the atmosphere to determine its makeup. These tragedies serve as a sobering reminder that air monitoring isn't just a regulatory box to mark as checked – it's a matter of life and death.
Many fatal incidents have been documented by OSHA that were the result of changing atmospheric conditions after entry, underscoring the critical importance of on-going air quality monitoring.
"These fatalities highlight why continuous air monitoring must be integral to every confined space operation—it's non-negotiable for ensuring worker safety."
The Importance of Atmospheric Monitoring
Atmospheric hazards may be in the space prior to entry or could be introduced by workers based on the scope of work in the confined space. Typically, atmospheric hazards manifest in four main variations.
Because of these potential risks, air monitoring is essential. Monitoring not only ensures compliance with OSHA standards (29 CFR 1910.146) but also provides real-time data to prevent accidents before they occur. Taking it a step further, continuous air monitoring can help to detect sudden changes in atmospheric conditions within confined spaces and give workers time to evacuate before negative health effects can set in.
What Should You Monitor For?
Looking at our list of atmospheric conditions from the previous section, it goes without saying that those specific conditions should be at the top of our list! OSHA requires testing of the following conditions, in this order.
Types of Monitoring Devices
There are many different monitoring devices and configurations available for detecting hazardous atmospheric conditions in confined spaces. Being equipped with the appropriate tool for the job is a necessary step in ensuring safe entry.
NOTICE: Personal monitoring devices may be used to monitor atmospheric conditions in a confined space; however, they must be used in conjunction with a compatible external pump and wand which is usually sold as a kit from the manufacturer.
Calibrating Your Equipment
Using the right equipment is only effective if it’s properly maintained and calibrated. Gas detectors must be regularly bump-tested and calibrated according to manufacturer’s guidelines.
"Warning: These devices may give false readings without proper calibration, leaving workers unknowingly exposed to dangerous conditions."
As a general rule of thumb, devices should be bump-tested daily before use and calibrated every 90 days; however, you should always refer to and follow the manufacturer’s guidelines for your specific device.
OSHA Requirements for Confined Space Monitoring
OSHA’s Confined Space Standard (29 CFR 1910.146) mandates air monitoring as part of any confined space entry program. According to the regulation, employers must:
Best Practices
To ensure adequate air monitoring, follow these best practices:
Air Monitoring Saves Lives!
Atmospheric hazards in confined spaces are often invisible, yet they pose significant dangers, from oxygen deficiency to toxic gases. Continuous air monitoring is crucial because it provides real-time data, allowing workers to detect life-threatening changes in the atmosphere before harm occurs. Without monitoring, workers may unknowingly enter environments with unsafe oxygen levels, flammable gases, or toxic compounds. Proper air monitoring ensures compliance with OSHA standards and can prevent fatal accidents by giving workers the critical information needed to avoid hazardous conditions. Simply put, monitoring saves lives.
ONLINE REFERENCES: